A Gathering of Gargoyles — Meredith Ann Pierce

The first portion of the riddle of Ravenna is solved, and Aeriel has broken the evil spell cast upon the darkangel Irrylath and made him mortal again. Weaving the dark-angel's black feathers into a throw and spreading it to the winds, they have flown across the Sea-of-Dust into the safety of Isternes.

ButAeriel cannot rest. The evil White Witch still holds a grasp on Irrylath--and her other dark sons continue to scourge the land of Avaric.

Now, the second part of Ravenna's riddle is given to Aeriel. Driven by an unknown force into unseen dangers, Aeriel embarks on a dangerous journey across the dust-deep sea--back to Avaric--to once more face the blood-hungry darkangels...and the powerful evil of the dreaded White Witch.